The textbook, prepared by leading MPGU teachers I. A. Dvoretskaya and N. V. Simonova, includes fragments of sources on the history of the Christian Church in the High Middle Ages. The texts are selected on a thematic basis and are accompanied by introductory essays about the authors and the era, as well as scientific comments. The manual can be used in organizing the educational process of bachelors and masters in the areas of training 050100.62 - pedagogical education (profile "History") and 030600.62 - history (profile " Historical political science").